Mechanism for the propulsion of vessels.



No. 773,006. I I x PATENTED OCT. 25, 19.04;

:OlG. DYOTT. I I

MECHANISM FOR THE PROPULSION 0F VESSELS. Q

APPLICATION FILED J N. 21. 1904. no' MODEL.

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3o accompanying drawings inillustration there- UNITED STATES Patented October 25, 1904.

PATENT. OFFICE.

Y CHARLES e. DYOTT, 015 NEW YORK, N. Y., ASSIGNOR OF ONE-HALF TO THOMAS K- MCGLONG, OF CAMDEN, NEW JERSEY.

MECHANISM FOR THE PROPULSION OF VESSELS;

SPEGIF1ZCAT1ON forming part of Letters Patent No. 773,006, datedOctober a5, 1904.

' Application filed January 21, 1964. semi No. 190,084. (Nd model.)

10 006/ w/wm it may concern:

:Be it known that I, OHARLEs G. DYoTT,.a citizen of the United States, and a resident of the city of New York, State of New York, have invented certain Improvements in Mechanisin for the Propulsion of Vessels, of which the following is a specification. V

This invention has as'its leading objects to obtain the maximum propulsion with the minimum expenditure of power, to red uce the centrifugal orla'teral force incidental to propulsion and increase the resultant force in the direction of travel, to reduce the lateral wave motion or wash, and throw the water backward into the trough left by the vessel. 7

In carrying out the invention the vessel is provided with two-oppositely-pitchedpropellers journaled on a common axis and revolved in opposite directions, preferably within an open tubular casing extending in the direction of travel, the propellers being constructed to catch the water with the least possible resistance and the highest possible resultant force in the direction of movement, to neutralize the centrifugal effects of each other, and to supplement each other in effecting a high resultant propelling force.

The nature and characteristicfeatures of the improvements will morefully appear by reference to the following description and the of, of which- Figure 1 represents a sectional sideelevation of an embodimentof the invention. Fig. 2 represents a view taken on the line 2 2 of Fig. 1. Fig. 3 represents a sectional view taken on the line 3 3 of Fig. 1. Fig. 4 represents a front elevation of a propeller. Fig.

5 represents a side elevation of a propeller viewed in the line of the blades. Fig. 6 represents a modified form of gearing for driving the propeller-shafts, and Fig. 7 represents a further modificationin the form of belts and pulleys for driving the propeller-shafts.

Referring to the drawings, the hull l is provided with the bearing-blocks 2, 3, and 4, in which the hollow propeller-shaft 5 is journaled, with the bearing-block 6, in which the driving-shaft 7 is journaled, and with the bearing-block-8, in which the propeller-shaft 9'isjournaled,'the shaft 9 also being journaled in the shaft5 and coupled to the driving-shaft 7. Fixed to the shaft 9 is the gearwheel 10, which is connected with the gearwheel 11, fixed on the shaft 5 through the gears 12 and 13, fixed on the shaft 14, and the idler 15-, the gears 12, 13, and 15' being supported on shafts which are mounted or journaled in the bearing-block 8. By this mechanism the shafts 5 and 9 and the respective propellers 16 and 17 fixed thereto are driven in opposite directions.

The propellers have their respective blades 16 and 17* fixed to hubs 16 and 17" of conefrustum form, the smaller faces of the frustra projecting forward, While the blades project backward therefrom. The respective propellers have their blades pitched in opposite directions, each blade having its outer portion turned to catch the water in advance of its inner portion in its forward motion of rotation, so as to sweep the water back in the direction of the axis of revolution.

I A tubular or cylindrical casing 18, carried by the supports 19 and having its ends open, surrounds the propellers. The tubular inlet 18 is 'flaredto gather water as it passes therethrough, and the propellers draw in water at the forward opening as they throw it back through the outlet 18". 7

The driving mechanism for rotating-the propeller-shafts may be variously modified. As

shown in Fig. 6, the propeller-shafts 5 and 9 may have fixed thereto the respective bevelgears 20 and 21, connected. by the idlers 22,

through which the driving-shaft 7 communioates opposite movements to the propeller shafts. As shown in Fig. 7, the propellershafts 5 and 9 may have fixedthereto the pulleys 23 and 24, connected by the belts 25 and 26 with the pulleys 27 and 28, fixed on the shaft 29, the belt 25 being twisted to turn the pulley 23 in the reverse direction to the pulley 24.

These improvements afiord not only im= proved means of propulsion, butthe invention is especially applicable for use on vessels traversing canals or narrow channels where the banks are liable to be injuriously affected by the usual Wash.

Having described my invention, I claim-- 1. A pair of propellers having oppositelypitched blades revolving on a common axis,

said blades projecting rearwardly relative to.

the direction of translation and forwardly relatively to the direction of rotation, in combination with mechanism for revolving said propellers in opposite directions, substantially as specified.

2. A pair of propellers having oppositelypitched blades revolving on a common axis, Said blades projecting rearwardly relatively CHAS. (ir- DYOTT.

In presence of THoM'As S. GATns, UTLEY E. CRANE, Jr. 

